CN106344003A - Multifunctional auxiliary electrocardiogram monitoring device - Google Patents

Multifunctional auxiliary electrocardiogram monitoring device Download PDF

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Publication number
CN106344003A
CN106344003A CN201610842817.2A CN201610842817A CN106344003A CN 106344003 A CN106344003 A CN 106344003A CN 201610842817 A CN201610842817 A CN 201610842817A CN 106344003 A CN106344003 A CN 106344003A
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CN
China
Prior art keywords
resistance
module
electrocardio
electrocardiosignal
electric capacity
Prior art date
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Pending
Application number
CN201610842817.2A
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Chinese (zh)
Inventor
戴明
陈思平
陈昕
林浩铭
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Shenzhen University
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Shenzhen University
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Priority to CN201610842817.2A priority Critical patent/CN106344003A/en
Publication of CN106344003A publication Critical patent/CN106344003A/en
Pending legal-status Critical Current

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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Measuring for diagnostic purposes; Identification of persons
    • A61B5/24Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
    • A61B5/316Modalities, i.e. specific diagnostic methods
    • A61B5/318Heart-related electrical modalities, e.g. electrocardiography [ECG]
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Measuring for diagnostic purposes; Identification of persons
    • A61B5/0002Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network
    • A61B5/0004Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network characterised by the type of physiological signal transmitted
    • A61B5/0006ECG or EEG signals
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Measuring for diagnostic purposes; Identification of persons
    • A61B5/68Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A61B5/6802Sensor mounted on worn items
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Measuring for diagnostic purposes; Identification of persons
    • A61B5/68Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A61B5/6813Specially adapted to be attached to a specific body part
    • A61B5/6823Trunk, e.g., chest, back, abdomen, hip
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Measuring for diagnostic purposes; Identification of persons
    • A61B5/68Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A61B5/683Means for maintaining contact with the body
    • A61B5/6831Straps, bands or harnesses
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Measuring for diagnostic purposes; Identification of persons
    • A61B5/72Signal processing specially adapted for physiological signals or for diagnostic purposes
    • A61B5/7203Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Measuring for diagnostic purposes; Identification of persons
    • A61B5/72Signal processing specially adapted for physiological signals or for diagnostic purposes
    • A61B5/7225Details of analog processing, e.g. isolation amplifier, gain or sensitivity adjustment, filtering, baseline or drift compensation

Abstract

A multifunctional auxiliary electrocardiogram monitoring device comprises a chest strap, a first electrocardiogram signal input module embedded in the chest strap, a hardware system capable of being taken out and placed in the chest strap as well as a middle connecting part accessing an electrocardiogram signal acquired from the first electrocardiogram signal input module to the hardware system, wherein a second electrocardiogram signal input module is embedded in a PCB (printed circuit board) of the hardware system, the first electrocardiogram signal input module is two silver-plated metal dry electrodes/Agcl wet electrodes, the second electrocardiogram signal input module is two platy silver-plated metal dry electrodes, one end of two biforked ends of the middle connecting part is buckled with one silver-plated metal dry electrode/Agcl wet electrode, and the other end is in plug connection with the hardware system; the hardware system comprises an input interface circuit receiving an electrocardiogram signal and recognizing the type of the electrode, an analog front end preprocessing module, an electrocardiogram dedicated chip, an MCU (microprogrammed control unit), an SD card module, a communication module, a power management module and an OLED (organic light emitting diode) display screen. The multifunctional auxiliary electrocardiogram monitoring device is small in size and comfortable and free to wear, and people can wear the chest strap to measure the electrocardiogram and can touch the dry electrodes in the PCB with double hands to measure the electrocardiogram.

Description

A kind of multi-functional electrocardio assists monitor device
Technical field
The present invention relates to medical instruments field, more particularly, to a kind of multi-functional electrocardio auxiliary monitor device.
Background technology
It is known that cardiovascular disease is one of disease of most threat of face of mankind nowadays.At present, China's heart and brain Vascular disease has reached 2.9 hundred million people, wherein has more than 3,000,000 people every year and dies from cardiovascular disease.Because cardiovascular disease is sent out There is when sick very big emergentness, thus easily lose the early diagnosiss therapeutic time of preciousness, it is desirable for this purpose that method be anti- Suffer from possible trouble.Because daily cardiac monitoring is the important guarantee means of patients ' lives safety, by the daily monitoring to heart Can be noted abnormalities sign in advance, can gain time for timely treatment.Daily prison is carried out to human heart situation by electrocardiosignal Control is the effective way of cardiac monitoring.But due to traditional cardiac monitoring employing is mostly agcl-ag electrode, needs using electrolysis Gel or binding agent, and using the three electrode input patterns with right leg drive electrode, very inconvenient during measurement, and its length Phase, skin allergy etc. is uncomfortable to react using easily causing, thus was not suitable for long periods of wear in daily life and uses.
Content of the invention
The technical problem to be solved in the present invention is, for the drawbacks described above of prior art, provides one kind that electrocardio can be entered The multi-functional electrocardio auxiliary monitor device of the long-time monitoring of row.
The technical solution adopted for the present invention to solve the technical problems is: a kind of multi-functional electrocardio auxiliary monitoring dress of construction Put, including a pectoral girdle, embedded pectoral girdle for contact human skin for gathering the first electrocardio of original electro-cardiologic signals Signal input module, the hardware system being placed in described pectoral girdle that can be taken off, in Headphone structure for by the first electrocardiosignal The electrocardiosignal of input module collection accesses the intermediate connector of hardware system, and the pcb circuit board of described hardware system is embedded with Second electrocardiosignal input module, described first electrocardiosignal input module is the dry electrode/agcl wet electrode of two silver plated metals, Described second electrocardiosignal input module is that two flat silver plated metals for two thumb contact for user do electricity Pole, the two ends of intermediate connector bifurcated respectively with embedded pectoral girdle on the dry electrode of silver plated metals/agcl wet electrode away from skin The side of skin is fastened and connected, the other end of intermediate connector and hardware system grafting;
Described hardware system includes: for receiving the first electrocardiosignal input module or the second electrocardiosignal input module Electrocardiosignal and according to electrode resistance, input electrode type is identified to enter the input interface of corresponding mode of operation Circuit, for by electrocardiosignal carry out preposition amplify and signal condition AFE (analog front end) pretreatment module, be used for AFE (analog front end) Pretreatment module output electrocardiosignal carry out two grades amplify and filtering and ad collection electrocardio special chip, to electrocardio special core Piece is controlled and the mcu communicating, the sd card being stored the electrocardiosignal obtaining from electrocardio special chip with file system form Module, electrocardiosignal is sent to host computer come shown and stored the communication module of process, battery, by usb interface to Battery charges and mcu is carried out with the power management module of power management, the oled display screen for showing electrocardiogram (ECG) data;
Described input interface circuit is connected with described first electrocardiosignal input module, the second electrocardiosignal input module, Described AFE (analog front end) pretreatment module connects input interface circuit and electrocardio special chip, electrocardio special chip, communication module, sd Card module, oled display screen are respectively connecting to mcu, described power management module and described battery, mcu, AFE (analog front end) pretreatment Module, electrocardio special chip, communication module connect.
Assist in monitor device in multi-functional electrocardio of the present invention, described communication module include bluetooth module and/or Wifi module and/or usb interface.
Assist in monitor device in multi-functional electrocardio of the present invention, described AFE (analog front end) pretreatment module includes: with The buffer amplifier circuit for impedance matching, low-pass filter circuit, AC coupled and height that the dry electrode of second silver plated metals connects What bandpass filter circuit was connected with electrocardio special chip carries out the instrumentation amplifier of two grades of amplifications, institute to two paths of differential signals State buffer amplifier circuit, low-pass filter circuit, AC coupled and high-pass filtering circuit, instrumentation amplifier is sequentially connected, institute The cut-off frequency stating low-pass filter circuit is 40hz, and the cut-off frequency of AC coupled and high-pass filtering circuit is 0.4hz.
Assist in monitor device in multi-functional electrocardio of the present invention, described instrumentation amplifier and the special core of electrocardio The double t wave trap of a 50hz is also included between piece.
Assist in monitor device in multi-functional electrocardio of the present invention, described buffer amplifier circuit includes mcp6004 system Row four-operational amplifier, first resistor, second resistance, described low-pass filter circuit include the first electric capacity, the second electric capacity, the 3rd Resistance, the 4th resistance, described AC coupled and high-pass filtering circuit include the 3rd electric capacity, the 4th electric capacity, the 5th resistance, the 6th electricity Resistance, the 7th resistance, the 8th resistance;
The positive input terminal of first amplifier in described four-operational amplifier connects to first via described first resistor The dry electrode of second silver plated metals, negative input end connect outfan, the positive input of second in described four-operational amplifier amplifier End connects via described second resistance and connects outfan to the dry electrode of second the second silver plated metals, negative input end, and described first The outfan of individual amplifier connects one end of 3rd resistor, the other end of 3rd resistor connect the 3rd electric capacity first end and via First electric capacity connects signal ground, and the outfan of described second amplifier connects one end of the 4th resistance, and the other end of the 4th resistance is even Connect the first end of the 4th electric capacity and connect signal ground via the second electric capacity, the first end priority of the 3rd electric capacity via the 5th resistance, 7th resistance connects the first end of the 4th electric capacity, and the second end priority of the 3rd electric capacity connects the via the 6th resistance, the 8th resistance Second end of four electric capacity, the node between the 5th resistance and the 7th resistance is connected with the node between the 6th resistance and the 8th resistance And it is connected to the negative input end of instrumentation amplifier, the second end of the 3rd electric capacity connects the positive input of instrumentation amplifier End, the positive input terminal of instrumentation amplifier connects signal ground via the 9th resistance, negative input end connects signal ground via the tenth resistance, Signal ground connects internal electric source via the 11st resistance, via the 12nd resistance eutral grounding.
Assist in monitor device in multi-functional electrocardio of the present invention, described mcu adopts stm32f103vct6, described Instrumentation amplifier adopts ina321, and described electrocardio special chip is adas1000.
Assist in monitor device in multi-functional electrocardio of the present invention, described hardware system is also included with described mcu even The shock module connecing and switch key.
Assist in monitor device in multi-functional electrocardio of the present invention, described host computer includes mobile phone, pda or pc.
Implement the multi-functional electrocardio auxiliary monitor device of the present invention, have the advantages that the present invention adopts bipolar electrode Input detection pattern, compared with traditional three electrode input patterns with right leg drive electrode, this bipolar electrode passes through AFE (analog front end) While the circuits improvement such as pretreatment module are to improve signal to noise ratio, electrocardiosignal input has lacked an elimination common mode inhibition noise Right leg drive electrode, carry and more freely facilitate, reduce and wear the bundle that this pectoral girdle formula electrocardiograph monitoring device brings to user Tie up sense;
In the present invention, input interface circuit can be identified to input electrode type, and then executes corresponding Working mould Formula, when being used the dry electrode of silver plated metals as input electrode it is not necessary to use electrolytic gel or binding agent, thus improve The comfortableness of this device and portability, also can be used as electrocardio input by agcl wet electrode and be touched by both hands embedded simultaneously The dry electrode of two silver plated metals in this hardware system pcb is carrying out the portable measurement of various ways;
And electrocardiosignal shows on host computer not only by communication module and stores, for medical personnel's reference, Can also store in sd card, medical personnel can be that doctor's diagnosis and treatment carry by carrying out off-line analysiss to the data preserving in sd card For auxiliary reference.
Brief description
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the structural representation that the multi-functional electrocardio of the present invention assists monitor device;
Fig. 2 is the structural representation of the preferred embodiment that the multi-functional electrocardio of the present invention assists monitor device.
Specific embodiment
In order to be more clearly understood to the technical characteristic of the present invention, purpose and effect, now comparison accompanying drawing describes in detail The specific embodiment of the present invention.
With reference to Fig. 1, the multi-functional electrocardio of the present invention assist monitor device include a pectoral girdle, embedded pectoral girdle for people The first electrocardiosignal input module for gathering original electro-cardiologic signals of body skin contact, being placed in described pectoral girdle of can be taken off Hardware system, in Headphone structure for the electrocardiosignal of the first electrocardiosignal input module collection is accessed hardware system Intermediate connector, the pcb circuit board of described hardware system is embedded with the second electrocardiosignal input module, described first electrocardiosignal Input module is the dry electrode/agcl wet electrode of two silver plated metals, and described second electrocardiosignal input module is two tabulars The dry electrode of silver plated metals for two thumb contact for user, the two ends of intermediate connector bifurcated respectively with embedded pectoral girdle On the dry electrode of silver plated metals/agcl wet electrode be fastened and connected away from the side of skin, the other end of intermediate connector with Hardware system grafting.
One end of the non-bifurcated of intermediate connector forms three sections of undergauge successively, and a section of foremost is for ground signalling, Two sections backward connect two-way electrocardiosignal, the first electrocardio that this two-way electrocardiosignal is fastened and connected from the two ends with its bifurcated The dry electrode of silver plated metals in signal input module/agcl wet electrode.
Described hardware system includes: input interface circuit 100, AFE (analog front end) pretreatment module 200, electrocardio special chip 300th, mcu 400, sd card module 600, communication module 500, battery, power management module 700, oled display screen.
Described input interface circuit 100 is with described first electrocardiosignal input module, the second electrocardiosignal input module even Connect, described AFE (analog front end) pretreatment module 200 connects input interface circuit 100 and electrocardio special chip 300, electrocardio special chip 300th, communication module 500, sd card module 600 are respectively connecting to mcu 400, described power management module 700 and described battery, Mcu 400, AFE (analog front end) pretreatment module 200, electrocardio special chip 300, communication module 500 connect.
Input interface circuit 100, for receiving the first electrocardiosignal input module or the second electrocardiosignal input module Electrocardiosignal and according to electrode resistance, input electrode type is identified so that hardware system enter corresponding mode of operation, The acquisition of electrode resistance can utilize resistance Definition Principle, is calculated by the current/voltage that current/voltage testing circuit gets Arrive, mcu can enter corresponding mode of operation according to electrode resistance.During i.e. input interface circuit 100 can be according to whether insert Between connector automatically selecting, when inserting intermediate connector, electrocardiogram acquisition is used as by the first electrocardiosignal input module defeated Enter end, now the input of the second electrocardiosignal input module disconnects automatically, pulls out just the opposite during intermediate connector, that is, from the Obtain a road electrocardiosignal in one electrocardiosignal input module/bis- electrocardiosignal input module, give AFE (analog front end) pretreatment mould Block 200.
AFE (analog front end) pretreatment module 200, for the electrocardiosignal of singly leading gathering dry for the second silver plated metals electrode 100 Carry out preposition amplification and signal condition;
Electrocardio special chip 300, the electrocardiosignal for exporting to AFE (analog front end) pretreatment module 200 carries out two grades of amplifications And software filtering and ad collection;Preferably, described electrocardio special chip 300 is adas1000.
Mcu 400, by configure the depositor of electrocardio special chip 300 electrocardio special chip 300 is controlled and Communication;Preferably, described mcu 400 adopts stm32f103vct6.
Sd card module 600, the electrocardiosignal obtaining from electrocardio special chip 300 is stored with fat32 file system form, Realize raw data file to keep in;
Communication module 500, above-mentioned electrocardiosignal is shown and storage process by being sent to host computer, host computer Both can show in real time it is also possible to show offline after storing.Described host computer include mobile phone and/or pda and/or pc it is preferred that Described communication module 500 adopts bluetooth bt4.0 module, and bluetooth supports one-to-one, one-to-many.
Power management module 700, is charged the battery by usb interface and carries out power management to mcu 400.Preferably , when electrocardio special chip 300 detects lead-fail detector, mcu 400 controls power management module 700 after Preset Time Disconnect to AFE (analog front end) pretreatment module 200, electrocardio special chip 300, communication module 500 power supply, such as mcu 400 passes through Power management module 700 is controlled to realize to the closing of the audion (field effect transistor) in the path of this three part power supplies.So The endurance of device can be improved.
During use, because input interface circuit can be identified to input electrode type, and then execute corresponding work Pattern.After pectoral girdle being worn, by one end of the non-bifurcated of the intermediate connector in Headphone structure and hardware system grafting, point Dry electrode/agcl wet electrode is fastened by snap arrangement, so with the silver plated metals of the first electrocardiosignal input module at the two ends of fork Afterwards hardware system is placed in described pectoral girdle, then measures, small volume and chainless during wearing;Can also by hardware system from Take out in pectoral girdle, take off intermediate connector, after hardware system is taken out from pectoral girdle, direct both hands pressing the second electrocardiosignal is defeated The dry electrode of flat silver plated metals entering in module measures, and measurement result can be shown by oled display screen.
The present invention adopts bipolar electrode to input detection pattern, with traditional three electrode input pattern phases with right leg drive electrode Than, this bipolar electrode by circuits improvement such as AFE (analog front end) pretreatment module to improve signal to noise ratio while, electrocardiosignal input Lack the right leg drive electrode of an elimination common mode inhibition noise, carried and more freely facilitate, reduce and wear this pectoral girdle formula heart The constraint sense that power utilization monitoring device brings to user;
In the present invention, input interface circuit can be identified to input electrode type, and then executes corresponding Working mould Formula, when being used the dry electrode of silver plated metals as input electrode it is not necessary to use electrolytic gel or binding agent, thus improve The comfortableness of this device and portability, also can be used as electrocardio input by agcl wet electrode and be touched by both hands embedded simultaneously The dry electrode of two silver plated metals in this hardware system pcb is carrying out the portable measurement of various ways.
And when electrode dry using silver plated metals, it directly contacts it is not necessary to make with skin when measuring electrocardiosignal With electrolytic gel or binding agent, thus it is very suitable for long cardioelectric monitor, and also expansible be applied to such as physiology The numerous areas such as monitoring, tele-medicine, electronics assistance and sports medical science, also can domestic;And electrocardiosignal not only by Communication module shows on host computer and stores, and for medical personnel's reference, can also store in sd card, medical personnel can pass through Off-line analysiss are carried out to the data preserving in sd card, is doctor's diagnosis and treatment provided auxiliary reference.
In specific embodiment, described hardware system also includes the switch key being connected with described mcu 400, and described switch is pressed Key is used for triggering power supply or cuts off the electricity supply.
Preferably, described hardware system also includes the shock module being connected with described mcu 400, and described shock module is used for By sending the unlatching/closing of vibration reminding user's power supply of different frequency or reminding user's electrocardiogram (ECG) data abnormal.
With reference to Fig. 2, in preferred embodiment, described AFE (analog front end) pretreatment module 200 includes being sequentially connected: with the second plating The dry electrode of silver metal 100 connect the buffer amplifier circuit 210 for impedance matching, low-pass filter circuit 220, AC coupled and High-pass filtering circuit 230, two paths of differential signals is carried out two grades amplification models ina321 instrumentation amplifier 240. The cut-off frequency of described low-pass filter circuit 220 is 40hz, and the cut-off frequency of AC coupled and high-pass filtering circuit 230 is 0.4hz.
Preferably, in order to increase filter effect, after prime is amplified, before electrocardio special chip 300, add a 50hz again Double t wave traps 250, to play the dual effect filtering Hz noise noise.
Described buffer amplifier circuit 210 includes the serial four-operational amplifier of mcp6004, first resistor r1, second resistance R2,40hz low-pass filter circuit 220 includes the first electric capacity c1, the second electric capacity c2,3rd resistor r3, the 4th resistance r4, described friendship Stream coupling and high-pass filtering circuit 230 include the 3rd electric capacity c3, the 4th electric capacity c4, the 5th resistance r5, the 6th resistance r6, the 7th electricity Resistance r7, the 8th resistance r8;
The positive input terminal of first amplifier in described four-operational amplifier connects to first via described first resistor r1 The dry electrode 100 of individual second silver plated metals, negative input end connect outfan, and second in described four-operational amplifier amplifier is just Input connects via described second resistance r2 and connects outfan to the dry electrode 100 of second the second silver plated metals, negative input end, The outfan of described first amplifier connects one end of 3rd resistor r3, and the other end of 3rd resistor r3 connects the 3rd electric capacity c3's First end and connect signal ground via the first electric capacity c1, the outfan of described second amplifier connects one end of the 4th resistance r4, The other end of the 4th resistance r4 connects the first end of the 4th electric capacity c4 and connects signal ground via the second electric capacity c2, the 3rd electric capacity c3 First end priority via the 5th resistance r5, the 7th resistance r7 connect the 4th electric capacity c4 first end, the second of the 3rd electric capacity c3 End successively connects second end of the 4th electric capacity c4, the 5th resistance r5 and the 7th resistance r7 via the 6th resistance r6, the 8th resistance r8 Between node be connected and be connected to the negative input end of ina321 with the node between the 6th resistance r6 and the 8th resistance r8, Second end of three electric capacity c3 connects the positive input terminal of ina321, the positive input terminal of ina321 via the 9th resistance r9 connect signal ground, Negative input end connects signal ground via the tenth resistance r10, and signal ground connects internal electric source via the 11st resistance r11, via the 12nd Resistance r12 is grounded.
Do not fix because the dry electrode of the second silver plated metals 100 contacts, so the change of contact impedance can be caused, this is to human body The extraction of electrocardiosignal causes certain difficulty, because the dry electrode of high impedance is easily disturbed by noise, noise source Predominantly motion artifact and power line interference.Therefore, the present invention connects a buffering below in the dry electrode of the second silver plated metals 100 and puts Big device, i.e. emitter follower, its effect is exactly that high impedance signal is converted into low-resistance antinoise signal, realizes the coupling of impedance, thus Make input obtain larger signal to noise ratio, make low-resistance antinoise signal be difficult to be disturbed by outside noise signal, in preferred embodiment, delay Rush the resistance r1=r2=100k ω that the positive input terminal of amplifier connects.
The energy of the electrocardiosignal due to more than 95% is all collected at 0~40hz, the therefore low-pass filter circuit of this device 220 cut-off frequencies are set to 40hz, only obtain the electrocardiosignal of 0~40hz frequency band, and low-pass filtering eliminates major part simultaneously 50hz Hz noise, in preferred embodiment, selects the parameter value of low-pass filtering as follows: r3=r4=1m ω, c1=c2=2uf. In order to increase the filter effect of 50hz Hz noise, behind again plus 50hz trap come to play dual except Hz noise noise Effect.
Additionally, in the hardware system of this device, by resistance r5, r6, r7, r8 and c3, c4 constitutes an AC coupled Circuit, its Main Function is that the faint electrocardiosignal obtaining textile electrode is efficiently couple to signal amplification below and hardware system In system, in addition electric capacity c3 and resistance r6, electric capacity c4 and resistance r7 also respectively constitute a passive high three-way filter.If selecting r6c3 =r7c4=τ, now the transmission function relational expression of circuit be: gdd (s)=s τ/s τ+1, cut-off frequency be fc=1/2 π r6c3, During circuit parameter selects, because big valued resistor can bring compared with high input impedance, be conducive to the extraction of signal, therefore, in this electricity Larger resistance is selected as possible in road.The feature of the spectrum signature further according to electrocardiosignal and electrocardiosignal simultaneously, passive high pass filter The cut-off frequency of ripple device is set to 0.4hz.Thus, select the parameter value of AC coupled as follows: r5=r6=r7=r8=2m ω, C3=c4=200nf.Additionally, this ac-coupled circuit also plays the effect of suppression electrode tip DC offset voltage, thus can Prevent tiny signal from the phenomenon of saturation occurring.
The AFE (analog front end) pretreatment module 200 of this device employs two-stage magnification scheme, puts initially with mcp6004 buffering Big device carries out emitter-base bandgap grading Hyblid Buffer Amplifier respectively, and the mainly impedance for improving input to reach the effect of impedance matching;Then low Bandpass filter circuit 220 carries out 40hz low-pass filtering to electrocardio primary signal;Subsequently pass through AC coupled and high-pass filtering circuit again Electrocardiosignal is effectively coupled in follow-up amplifying circuit by 230, carries out 0.4hz high-pass filtering simultaneously;Recycle instrument Operational amplifier 240ina321 carries out two grades of amplifications to two paths of differential signals;Pass through the double t wave trap 250 of 50hz again and carry out 50hz Power frequency interference signals Filtering Processing, makes electrocardiosignal frequency limitation in the band logical frequency range of 0.4-40hz;And pass through adas1000 After special chip amplifies and processes, give processor stm32f103vct6 to carry out ad sampling;Finally by mcu 400 by the heart The signal of telecommunication is sent to mobile phone, pda or the pc with Bluetooth receptions head, showing in real time for electrocardiosignal by bluetooth bt4.0 again Show and preserve.
It is, of course, understood that mcu can also carry out wired upload by usb, for example, usb interface in Fig. 1 Power pins are connected with power management module 700, are connected by usb transducer between data pin and mcu 400, usb interface Both it had been used to power management module 700 to charge, and can be used for uploading data under the control of mcu 400 to host computer again.
The present invention is used for realizing long ecg signal acquiring and storage in patient's daily life, so the low work(of system The endurance of consumption type and battery is one of core of this device.Based on the realization of low-power consumption, this device employ following some Design: one is, Analog Circuit Design aspect selects super low-power consumption analog device, such as instrument in AFE (analog front end) pretreatment module 200 Table operational amplifier 240 adopts the ina321 chip of ti company, and that buffer amplifier circuit 210 is selected is microchip Mcp6004 family chip.This two chip is all low-voltage, low-power consumption precision amplifier, is powered using single supply, supply voltage Scope is 1.8~5.5v, and is suitable for battery and powers.And above-mentioned two chips have outstanding common mode rejection ratio and less temperature Drift, is highly suitable for small physiological signal and amplifies;Two are, mcu 400 selects low-power chip stm32f103vct6 core Piece;Three are, adopt low-power consumption bluetooth bt4.0 when data uploads, and in addition replace battery to realize system power supply using usb interface;Four It is that whole device uses 3.0v single supply and powers chargeable lithium cell, battery voltage range is 3.7~4.2v, power supply pipe The tlv70030 linear voltage regulator that reason module 700 employs ti exports 3.0v voltage to realize fixing.
This device can carry out long-term cardiac monitoring to cardiac health, and auxiliary doctor or user find heart early Defect, the detection that simultaneously treatment of heart patient can be assisted, thus side auxiliary passes judgment on the effect of medicine.Have just Take, chainless, unperturbed, the feature of low-power consumption.
In sum, the present invention adopts bipolar electrode to input detection pattern, with traditional three electrodes with right leg drive electrode Input pattern is compared, this bipolar electrode by circuits improvement such as AFE (analog front end) pretreatment module to improve signal to noise ratio while, electrocardio Signal input part has lacked the right leg drive electrode of an elimination common mode inhibition noise, carries and more freely facilitates, reduces and wear The constraint sense that this pectoral girdle formula electrocardiograph monitoring device brings to user;Input interface circuit can be known to input electrode type Not, so execute corresponding mode of operation, when being used the dry electrode of silver plated metals as input electrode it is not necessary to use electrolysis coagulate Glue or binding agent, thus improve comfortableness and the portability of this device, also can be used as electrocardio by agcl wet electrode simultaneously Input and touch the dry electrode of two silver plated metals in embedded this hardware system pcb by both hands and carry out various ways just Take measurement;And electrocardiosignal shows on host computer not only by communication module and stores, for medical personnel's reference, also It is possibly stored in sd card, medical personnel can be provided for doctor's diagnosis and treatment by carrying out off-line analysiss to the data preserving in sd card Auxiliary reference.
Above in conjunction with accompanying drawing, embodiments of the invention are described, but the invention is not limited in above-mentioned concrete Embodiment, above-mentioned specific embodiment is only schematically, rather than restricted, those of ordinary skill in the art Under the enlightenment of the present invention, in the case of without departing from present inventive concept and scope of the claimed protection, also can make a lot Form, these belong within the protection of the present invention.

Claims (8)

1. a kind of multi-functional electrocardio assist monitor device it is characterised in that include a pectoral girdle, embedded pectoral girdle and human body skin The first electrocardiosignal input module for gathering original electro-cardiologic signals of contact, the hardware being placed in described pectoral girdle that can be taken off System, the centre for the electrocardiosignal of the first electrocardiosignal input module collection accesses hardware system in Headphone structure connect Fitting, the pcb circuit board of described hardware system is embedded with the second electrocardiosignal input module, described first electrocardiosignal input mould Block is the dry electrode/agcl wet electrode of two silver plated metals, described second electrocardiosignal input module be two flat for For the dry electrode of silver plated metals of two thumb contact of user, the two ends of intermediate connector bifurcated respectively with embedded pectoral girdle on one Dry electrode/agcl the wet electrode of individual silver plated metals is fastened and connected away from the side of skin, the other end of intermediate connector and hardware system System grafting;
Described hardware system includes: for receiving the heart of the first electrocardiosignal input module or the second electrocardiosignal input module The signal of telecommunication is simultaneously identified to enter the input interface circuit of corresponding mode of operation to input electrode type according to electrode resistance (100), be used for by electrocardiosignal carry out preposition amplify and signal condition AFE (analog front end) pretreatment module (200), for mould The electrocardiosignal that plan front end pretreatment module (200) exports carries out two grades of amplifications and filtering and the electrocardio special chip of ad collection (300), electrocardio special chip (300) is controlled and communicate mcu (400), will obtain from electrocardio special chip (300) Sd card module (600) that electrocardiosignal is stored with file system form, electrocardiosignal is sent to host computer shown and Store the communication module (500) processing, battery, charged the battery by usb interface and power management is carried out to mcu (400) Power management module (700), for showing the oled display screen of electrocardiosignal;
Described input interface circuit (100) is connected with described first electrocardiosignal input module, the second electrocardiosignal input module, Described AFE (analog front end) pretreatment module (200) connects input interface circuit (100) and electrocardio special chip (300), and electrocardio is special Chip (300), communication module (500), sd card module (600), oled display screen are respectively connecting to mcu (400), described power supply pipe Reason module (700) and described battery, mcu (400), AFE (analog front end) pretreatment module (200), electrocardio special chip (300), communication Module (500) connects.
2. multi-functional electrocardio auxiliary monitor device according to claim 1 is it is characterised in that described communication module includes indigo plant Tooth module and/or wifi module and/or usb interface.
3. multi-functional electrocardio auxiliary monitor device according to claim 1 is it is characterised in that described AFE (analog front end) pretreatment Module (200) includes: the buffer amplifier circuit (210) for impedance matching that electrode (100) dry with the second silver plated metals is connected, Low-pass filter circuit (220), AC coupled and high-pass filtering circuit (230) be connected with electrocardio special chip (300) to two-way Differential signal carries out the instrumentation amplifier (240) of two grades of amplifications, described buffer amplifier circuit (210), low-pass filter circuit (220), AC coupled and high-pass filtering circuit (230), instrumentation amplifier (240) are sequentially connected, described low-pass filtering electricity The cut-off frequency on road (220) is 40hz, and the cut-off frequency of AC coupled and high-pass filtering circuit (230) is 0.4hz.
4. multi-functional electrocardio auxiliary monitor device according to claim 3 is it is characterised in that described instrumentation amplifier (240) also include the double t wave trap (250) of a 50hz and electrocardio special chip (300) between.
5. multi-functional electrocardio auxiliary monitor device according to claim 3 is it is characterised in that described buffer amplifier circuit (210) the serial four-operational amplifier of mcp6004, first resistor, second resistance, described low-pass filter circuit (220) bag are included Include the first electric capacity, the second electric capacity, 3rd resistor, the 4th resistance, described AC coupled and high-pass filtering circuit (230) include the 3rd Electric capacity, the 4th electric capacity, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance;
The positive input terminal of first amplifier in described four-operational amplifier connects to first second via described first resistor The dry electrode of silver plated metals (100), negative input end connect outfan, the positive input of second in described four-operational amplifier amplifier End connects via described second resistance and connects outfan to the dry electrode (100) of second the second silver plated metals, negative input end, described The outfan of first amplifier connects one end of 3rd resistor, the other end of 3rd resistor connect the 3rd electric capacity first end and Connect signal ground via the first electric capacity, the outfan of described second amplifier connects one end of the 4th resistance, the 4th resistance another End connects the first end of the 4th electric capacity and connects signal ground via the second electric capacity, and the first end priority of the 3rd electric capacity is via the 5th electricity Resistance, the 7th resistance connect the first end of the 4th electric capacity, and the second end priority of the 3rd electric capacity connects via the 6th resistance, the 8th resistance Second end of the 4th electric capacity, the node between the node between the 5th resistance and the 7th resistance and the 6th resistance and the 8th resistance is even Connect and be connected to the negative input end of instrumentation amplifier (240), the second end of the 3rd electric capacity connects instrumentation amplifier (240) positive input terminal, the positive input terminal of instrumentation amplifier (240) connects signal ground, negative input end warp via the 9th resistance Signal ground is connect by the tenth resistance, signal ground connects internal electric source via the 11st resistance, via the 12nd resistance eutral grounding.
6. multi-functional electrocardio auxiliary monitor device according to claim 5 is it is characterised in that described mcu (400) adopts Stm32f103vct6, described instrumentation amplifier (240) adopts ina321, and described electrocardio special chip (300) is adas1000.
7. multi-functional electrocardio auxiliary monitor device according to claim 1 is it is characterised in that described hardware system also includes The shock module being connected with described mcu (400) and switch key.
8. multi-functional electrocardio auxiliary monitor device according to claim 1 is it is characterised in that described host computer includes handss Machine, pda or pc.
CN201610842817.2A 2016-09-22 2016-09-22 Multifunctional auxiliary electrocardiogram monitoring device Pending CN106344003A (en)

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CN106647418A (en) * 2017-02-18 2017-05-10 深圳市晓控通信科技有限公司 Intelligent heart-protecting armor based on Internet of Things
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CN110179457A (en) * 2019-05-31 2019-08-30 电子科技大学 A kind of more physiological signal detecting devices of flexible wearable
CN110179457B (en) * 2019-05-31 2021-05-07 电子科技大学 Flexible wearable multi-physiological-signal detection device
CN113054931A (en) * 2021-03-05 2021-06-29 北京航空航天大学 Signal conditioning circuit structure and method for piezoresistive sensor
CN113054931B (en) * 2021-03-05 2022-10-21 北京航空航天大学 Signal conditioning circuit structure and method for piezoresistive sensor

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